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-   -   Boundary codition for multiphase (http://www.cfd-online.com/Forums/fluent/30443-boundary-codition-multiphase.html)

Nima Sheyad October 29, 2002 10:05

Boundary codition for multiphase
 
Hi everybody I'm trying to simulate a two phase flow. The problem is condensation of a turbulent annular film of R-22 vapor in a tube. I've used Fluent 5.23 to solve the problem but I haven't known how to enter some boundary conditions. The VOF two multiphase model has used for simulating the case. The turbulent model is standard k-epsilon .The coordinate system is cylindrical. At flow inlet, the velocity of vapor core is different from velocity of liquid film. The boundary condition is: U = Uin,v if 0 < r < R - d U = Uin,l if R - d < r < R "d" is liquid film thickness. At flow outlet I have to enter (dk/dz) =0 and (d epsilon/dz) =0. Please help me in this regard. Your kind attention and your prompt reply would be highly appreciated. Yours Faithfully Nima Sheyad


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